Siemens ADSL 500 - Manual (Page 25)

Chapter 3: Connection Mode
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9. Then you have set the web configuration successfully. And you can surf on the Internet.
Note:
If you have multiple PCs on the LAN, you may enable DHCP function on the private or public
IP address. The ADSL Router implements a built-in DHCP server, which assigns IP addresses
to the clients PCs on the LAN.